Definitions:

1. A defensive obstacle made by felling trees and arranging them with sharpened branches facing outward toward the enemy to obstruct movement or attacks. NOUN
   • The soldiers reinforced the perimter with an abattis to deter a cavalry charge.
2. A means of defense formed by felled trees, the ends of whose branches are sharpened and directed outwards, or against the enemy. NOUN
   • The fortress was fortified with a dense abattis, making it a challenging target for any potential attackers.

Synonyms:

• abatis